John t



Patented 0ot.6, 1891.

CORE FOR ELECTRIC SOLENOIDS.

(No Model.)

INVENTOR: Jalenfhzlliams.

WIINESJEJ: Who/W W lw' ATTORNEYS WWW UNITED STATES PATENT OFFICE,

JOHN T. IVILLIAMS, OF MOUNT VERNON, ASSIGNOR TO THE INTERNATIONAL PORTELEOTRIO COMPANY, OF NEIV YORK, N.

CORE FOR ELECTRIC SOLENOIDS.

SPECIFICATION forming part of Letters Patent No. 460,926, dated October 6, 1891.

Application filed December 18, 1890. Serial No. 375,137. (No model.)

To aZZ whom it may concern: Zone of said coil, so that while the traction of Be it known that I, JOHN T. WILLIAMS, a the coil on the first member has commenced citizen of the United States, residing at Mount to decrease the traction of the coil on the sec- 5 5 Vernon, in the county of Vestchester and nd member is added to that still exerted on State of New York, have invented new and the first member, and after the core has aduseful Improvements in Cores for Electric vanced still farther the coil begins to exert a Solenoids, of which the following is a specitraction upon the third member of the core, fication. so that the traction exerted by the coil upon 6c This invention has for its object to provide the core remains as near as possible uniform. to a novel core for an electric solenoid; and it If a reciprocating motion is to be imparted consists in the combination, with a coil, of a to the core B, a second motor-coil A is promagnetic core movable axially through the vided, which is so arranged that it will exert coil and composed of a series of members of a traction upon the core in a direction oppo- 65 difierent length and varying diameter, which site to that exerted by the coil A, and after are fitted one within the other in metallic the core has been drawn into the coil A to the contact. desired point the electric current is changed The invention also consists in the combinafrom the coil A to the coil A, so that the lattion, with a coil, of a magnetic core movable ter will cause the core to move in the oppo- 7o axially through the coil and composed of a site direction. -If the core B is to be moved series of tubular members of ditferent length in one and the same direction, a motor-coil and varying in diameter, which are fitted one A is provided, which will be vitalized at the Within the other in metallic contact and have proper time, so as to exert a traction upon their middle arranged in the same plane. the core in the same direction as the coil A 75 Figure 1 is a longitudinal central section in after the latter coil has been devitalized. the plane a" m, Fig. 2. Fig. 2 is a transverse In order to retain the different members of section in the plane y y, Fig. 1. the core in the proper relation to each other, In the drawings, the letter A designates a they may be connected by rivets c or by other motor or solenoid-coil, and B a magnetic core, suitable means.

which fits the interior of the coil, so that when hat I claim as new, and desire to secure 0 the coil is vitalized said core is drawn into the by Letters Patent, is-

coil bythe axial magnetism. This axial mag- 1. The combination, with a coil, of a magnetism exerts its maximum traction upon the netic core movable axially through the coil core at the time when the core enters the coil, and composed of a series of members of dif- 85 but the traction decreases as the coil advances, ferent length and varying diameter, which 3 5 and it ceases to act when the middle zone as are fitted one within the other in metallic of the coil has reached the middle zone of the contact, substantially as described. coil. In order to enable the motor or solen- 2. The combination, with a coil, of a magoid-coil to exert a uniform or nearly uniform netic core movable axially through the coil 0 traction upon the core as the latter is drawn and composed of a series of tubular members 0 into the coil, 1 construct the core of a series of different length and varying in diameter, of tubular members I) b 12 which are of difwhich are fitted one within the other in meferent lengths and varied in diameter, so as tallic contact and have their middle zones arto be fitted concentrically one into the other, ranged in the same plane, substantially as 95 as shown in Fig. 1. It is desirable that the described.

various members of the core shall be so ar- In testimony whereof I have hereunto set ranged in relation to each other that their my hand in the presence of two subscribing middle zones are situated in one and the witnesses. same plane.

In Fig. 1 of the drawings the end N of the outer member of the core has already passed -Witnesses:

JOHN T. IVILLIAMS.

through the motor-coil A and the end N of M. 0. IIAUFF, the second member has reached the middle E. F. KASTENHUBER. 

